Lexus RX450H Manual page 323

2-4. Using other driving systems

Hill-start assist control buzzer

When hill-start assist control is activated, the buzzer will sound once.

In the following situations, hill-start assist control will be canceled and
the buzzer will sound twice.
• No attempt is made to drive the vehicle within approximately 2 sec-
onds of releasing the brake pedal.
• The shift lever is moved to P.
• The parking brake is applied.
• The brake pedal is depressed again.
• The brake pedal has been depressed for more than approximately 3
minutes.

If a buzzer other than the hill-start assist control buzzer is sounding, the
hill-start assist control buzzer may not sound when the system is acti-
vated or canceled.

If the slip indicator comes on
It may indicate a malfunction in the system. Contact any authorized Lexus
dealer or repairer, or another duly qualified and equipped professional.
CAUTION

Hill-start assist control

Do not overly rely on hill-start assist control. Hill-start assist control may
not operate effectively on extremely steep inclines or roads covered in ice.

Unlike the parking brake, hill-start assist control is not intended to hold
the vehicle stationary for an extended period of time. Do not attempt to
use hill-start assist control to hold the vehicle on an incline for an
extended period of time, as doing so may lead to an accident.
300
RX450h_EE